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WELDING AND GENERAL FAULTS
Fault Remedies
Surface a) Insufficient shielding gas (TIG). a) Check shielding gas flow.
porosity b) Bore of nozzle too small (TIG). b) Fit larger ceramic nozzle.
c) Surplus degreasing agent (MMA & TIG) c) Remove degreasing agent and dry.
d) Arc too long (MMA and TIG). d) Shorten the arc.
a) Incorrect torch or rod angle (TIG). a) Correct the angles -see TIG welding
f) Poor quality materials (MMA and TIG) f) Use better quality materials.
Undercut a) Incorrect welding technique. a) Correct rod handling.
(MMA and TIG) b) Current too high. b) Reduce current setting.
c) Incorrect welding speed. c) Increase hand travel speed.
d) Wrong electrode (MMA). d) Change to correct size (type).
Lack of a) Insufficient current. a) Increase current setting.
penetration b) Welding too fast. b) Decrease hand travel speed.
(MMA and TIG)
Cracking and These faults are difficult to detect without the use of specialized equipment.
Inclusions If cracking shows, seek the advice of a welding engineer.
No welding a) Thermostat tripped a) Cease welding and allow the fan to contin-
ue to output run thereby cooling the unit.
Decrease welding duty cycle (welding on
to off time).
b) Circuit Breaker tripped b) press to reset
c) Main input fuses blown. c) Replace with the same value fuse.
No Arc Strike a) Contaminated Tungsten a) Regrind/Replace Tungsten
In TIG b) Poor welding circuit b) Check cables
c) Current set below 15A c) Increase current setting
SECTION 5 TROUBLESHOOTING
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